Naturally occurring thulium (69Tm) is composed of one stable isotope, 169Tm, with 100% natural abundance. Thirty-nine radioisotopes have been characterized from 144Tm to 183Tm; with the most stable are 171Tm with a half-life of 1.92 years, 170Tm with a half-life of 128.6 days, 168Tm with a half-life of 93.1 days, and 167Tm with a half-life of 9.25 days.
Naturally occurring thulium (69Tm) is composed of one stable isotope, 169Tm, with 100% natural abundance. Thirty-nine radioisotopes have been characterized from 144Tm to 183Tm; with the most stable are 171Tm with a half-life of 1.92 years, 170Tm with a half-life of 128.6 days, 168Tm with a half-life of 93.1 days, and 167Tm with a half-life of 9.25 days.
Source: Wikipedia "Isotopes of thulium" · CC BY-SA 4.0
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